The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 2002
Filed:
May. 04, 2001
Applicant:
Inventor:
Jan Wesolowski, Redwood City, CA (US);
Assignee:
Network Equipment Technologies, Inc., Fremont, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03L 7/08 ; H03L 7/18 ; H03L 7/197 ;
U.S. Cl.
CPC ...
H03L 7/08 ; H03L 7/18 ; H03L 7/197 ;
Abstract
Methods and systems are disclosed for eliminating a phase transient of a controlled frequency oscillator, caused by replacing a first reference signal by a second reference signal when the first reference signal becomes corrupted or otherwise unavailable, and for running a controlled frequency oscillator in a frequency-controlled holdover mode. The contradictory requirements of using a relatively low-cost controlled frequency oscillator tunable over a relatively wide frequency range and achieving high stability of its frequency in holdover mode are satisfied.